《九章算术》中,将底面为长方形且有一条侧棱与底面垂直的四棱锥称之为阳马,将四个面都为直角三角形的四面体称之为鳖臑.如图,在阳马
中,侧棱
底面
,且
,过棱
的中点
,作
交
于点
,连接
.则有( )
![](https://img.xkw.com/dksih/QBM/2020/12/16/2615422691876864/2633304107286528/STEM/b1dd4a43-f3b2-4494-a8dd-9fa6146d4dba.png?resizew=232)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5a1b49f64e0065edad868b25e9fcada3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3294cff9c742de2d2cee7472138eb363.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/48f3c9abbd78e9a6840ee5f30381daac.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9a4a6a1e70241d600bc6c104313eac61.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d2be49c37e30a3ced0364c3e74d8c687.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1fd359532ed4cf7360b419aaaf5a2d9.png)
![](https://img.xkw.com/dksih/QBM/2020/12/16/2615422691876864/2633304107286528/STEM/b1dd4a43-f3b2-4494-a8dd-9fa6146d4dba.png?resizew=232)
A.PB与平面DEF垂直 | B.四面体DBEF是鳖臑 |
C.四面体DBCE是鳖臑 | D.四面体DBEF的体积为![]() |
20-21高二上·重庆沙坪坝·阶段练习 查看更多[2]
更新时间:2021-01-10 20:53:49
|
相似题推荐
多选题
|
适中
(0.65)
名校
解题方法
【推荐1】在棱长均为1的正三棱柱
中,点E在棱
上运动,则下列说法正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/42d3a82b8e587ee890467835bc4e854c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2777840758e70e7dbbc18cef8f3d6d2b.png)
A.![]() ![]() |
B.存在点E使得直线![]() ![]() |
C.三棱锥![]() |
D.当点E为棱![]() ![]() ![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
名校
【推荐2】一副三角板由一块有一个内角为60°的直角三角形和一块等腰直角三角形组成,如图所示,
,
,
,
,现将两块三角形板拼接在一起,得三棱锥
,取
中点
与
中点
,则下列判断中正确的是( )
![](https://img.xkw.com/dksih/QBM/2021/5/16/2722562495258624/2724466769264640/STEM/a2df572f-770e-4ff7-a7a3-b86179f94665.png?resizew=478)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3a180fe8460e84c45ef1b2c2bb6faeca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5b8b98b2f83279a49e94d9f48c5e6f2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4a288554fe25fe0a72530eb29756e1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b7fc9b1a395ad2e2fb2b207560754dc7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/89c416b5f18fbb0b7f79e8a5702acd13.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1dde8112e8eb968fd042418dd632759e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60ef95894ceebaf236170e8832dcf7e3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac047e91852b91af639feec23a9598b2.png)
![](https://img.xkw.com/dksih/QBM/2021/5/16/2722562495258624/2724466769264640/STEM/a2df572f-770e-4ff7-a7a3-b86179f94665.png?resizew=478)
A.![]() ![]() |
B.![]() ![]() |
C.三棱锥![]() |
D.若平面![]() ![]() ![]() ![]() |
您最近一年使用:0次
【推荐1】如图,在直三棱柱中,若
,
,
是棱
的中点,则下列说法正确的是( )
A.点![]() ![]() ![]() |
B.![]() ![]() |
C.点![]() ![]() ![]() |
D.![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
解题方法
【推荐2】已知多面体
中,平面
是正方形,
平面
,
,且
,
,取
中点
,在平面
中,作
,且
,则下列说法中正确的是( )
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/ea8450e0-61fc-4fc1-b42b-b33e7ecea603.png?resizew=165)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9165d9bfbb0f0d19eb482c2a4c1b29b7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/44b190c8d3d7d7d0e6e959e8a52eae90.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ac192cfba38bf0e2df0c2d490596aa65.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d62d95da5235c7fe783203d8f7c81b64.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e4280be91682e5d8a0d0704190319bb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/895dc3dc3a6606ff487a4c4863e18509.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/20af148464904e21f4374cc8fb886fba.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf193ff4546dfb09008d6354f374b280.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f900d8744217015f808d935656c2857b.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2022/11/28/ea8450e0-61fc-4fc1-b42b-b33e7ecea603.png?resizew=165)
A.![]() ![]() |
B.直线![]() ![]() ![]() |
C.![]() |
D.![]() ![]() ![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
解题方法
【推荐1】(多选)如图,在四棱柱中,
,
,
,
,
,
分别是棱
和
的中点,则下列说法中正确的是( )
A.![]() ![]() ![]() ![]() | B.![]() ![]() |
C.![]() ![]() | D.![]() ![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
名校
解题方法
【推荐2】正方体
的棱长为
,球
和球
的球心
,
都在线段
上,球
,球
外切,且球
,球
都在正方体的内部(球可以与正方体的表面相切),记球
和球
的半径分别为
,
,则( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/24bb49fdc6b6bbb2449fdf8a0de769d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c4f6f74444b2b7947fc6e35c8d62322.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2858005b9ae89ae080d83dcc13cf8e81.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2b3e95410f3b4fcb0cba425b521d1f67.png)
A.![]() | B.当![]() ![]() ![]() |
C.![]() ![]() | D.球![]() ![]() ![]() |
您最近一年使用:0次
多选题
|
适中
(0.65)
名校
【推荐3】如图,在菱形ABCD中,AB=2,
,M为BC的中点,将△ABM沿直线AM翻折到△AB1M的位置,连接B1C和B1D,N为B1D的中点,在翻折过程中,则下列结论中正确的是( )
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff5a86745bfe1dfe7bc2683811210330.png)
A.始终有AM⊥B1C |
B.线段CN的长为定值 |
C.直线AB1和CN所成的角始终为![]() |
D.当三棱锥B1﹣AMD的体积最大时,其外接球的表面积是![]() |
您最近一年使用:0次